Proficiency testing is a method used to evaluate the accuracy and reliability of laboratory results. In this process, laboratories analyze the same samples and compare their results to a known standard or reference. This helps ensure that testing methods are consistent and that laboratories can produce valid results. The main goal of proficiency testing is to identify areas for improvement in laboratory practices. It is often required by regulatory bodies and accreditation organizations to maintain high standards in fields such as clinical laboratories, environmental testing, and food safety. Regular participation in proficiency testing helps laboratories enhance their quality control measures.